Thomas kirk wood



(No Model.)

T. KIRKWOOD.

GRATB POR FURNAGBS.

Patented Aug. 21, 1888.

h #lill "lill WITNESSES:

am 5? 92M ATTORNEY Nv PETERS, Mamhonpmr, wuhmgtm D. C.

UNITED STATES THON A S KIRKVVOOD,

GRATE FOR 0F NEW YORK, N. Y.

FURNACES.

SPECIFICATION forming part of Letters Patent No. 388,204, dated August 21, 1888.

Application filed November 4, i887.

To all whom, it may concern,.-

Be it known that I, 'lnoMAs KrnKwooD, a citizen of the United States, and a resident of the city of New York, county and Stat-e of New York, have invented certain new and useful Improvements in Grates for Furnaces, 0f which the following is such a full, clear, concise,and exact description as will enable others skilled in the art to which my invention appertains to make and use the same, reference be ing had tothe accompanyingdrawings, forming part of this specification.

In grates for furnaces where the supportingbars and projecting fuelbars were formed together in a single homogeneous casting there was no provision for the separate disconnection of the respective fuel-bars, and the breaking or burning out of one or more ofthe same involved the renewal of an entire section. To avoid this diliiculty, and also prevent injury by the expansion and contraction of the metal nearest the fire, gratos were also made with separate supporting or cross bars, upon which were placed or secured independent and disconnected fuel-bars; but such construction was troublesome and expensive to manufacture, involving the use of many patterns, and even after such bars were cast much time was spent in iitting and adjusting them upon the cross-bars. IIspecially in shaking-grates, where the projecting fuel-bars of adjacent sections alternated and interlapped and a nice adjustment was required,was this fitting of the separate independent fuel-bars a serions item in the cost of construction.

The object of my invention is to overcome the defects in operation and difficulties in construction heretofore experienced, and at the same time produce a more efficient grate. To accomplish these objccts,l cast the fuel-bars in connected series with suitable intermediary grooves, sueh series being preferably cast directly upon the cross-bars, which act as chilled cores; and my invention consists in the e011- struction and arrangement of the various parts, as hereinafter more I'ull y described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan View of a shaking-grate embodying my improvement. Fig. 2 is a longitudinalsection Serial No. 251298. (No model.)

cutting one of the intermediary grooves, the form ofthe grooves on other sections being indicated by dotted lines, and showing in side elevation shaking attachments such as have hitherto been used. Fig. 3 is a vertical crosssection, taken on the line y y of Fig. 1, showing in section fuel-bars with intermediary grooves and resting upon cnd bar; while Fig. 4 is taken on the line c z of Fig. 1, and shows similarly-formed fuel-bars upon supporting eross-bar.

The side bars, A, of the grate are shown as formed with bearings, in which are slotted trunnions e for receiving the ends of the crossbars B, which bars are provided with rocking plates C, connecting with the general oscillating bar D, and operated through the link D and lever E by the shaker-handle F, in the ordinary manner.

Near the ends of the side bars are lugs or seats L,for receiving the end bars, H, and upon the crossbars and end bars are the fuel-bars G, formed in series with intermediary grooves, the said fuel-bars being preferably cast upon the respective cross and end bars, which during the casting act as chilledi-cores for the metal which forms the fuel-bars.

The grooves g form dividing-lines between adjacent fuclbars, and should be of sufiicient depth to permitof the separation of such bars one from another, and preferably terminate their depth in a wedge or V shaped form and extend vertically as well as horizontally between the bars.

1n agrate so formed the intermediary grooves afford draft-spaces, reducing the dead arca of the floor, as well as allow space for the contraetion and expansion of the metal nearest the tire; and when a fuel-bar becomes broken or burned out the said grooves form a dividingline along which the imperfect bar may be broken oit' from the adjacent connecting-bars and a new bar substituted; also, being cast in series, few patterns are required, a proper relative position of the respective bars secured,and the interlapping sections properly adjusted. Moreover, when the end and cross bars are used as cores and the fuel-bars cast thcreon,the molten iron poured into the mold and striking against the cold iron core becomes chilled, and

0f the same, taken on the line w x of Fig. 1,

a denser and more durable casting is secured,

While at the same time a snug fit is made and the adhesion of the parts effected,bhe1eby tendwith supporting cross-bars B, ofthe fuel-bars ing to overcome dangers of warping. G, cast onto the said erosmfbars and formed in Having thus described my inventiomwhabl series with intermediary dividing-grooves g, claim as new, and desire tio secure by Letters whereby the said fuel-bars are rigidly attached Patent, is to the said cross-bars and are adapted to be Sep l. In a grate for furnaces, the combinationy arated, substai'lbially as set forth. with supporting cr0ss-bars,of f nel-bars formed THOMAS KIRIUVOOD. in series with intermediary or dividinggrooves g,whereby said fuel-bars are adapted t0 be separated, substantially as set; forth.

2. In a, grate for furnaces, the combination,

Vitnesses:

HUBERT A. BANNING, R. G. Mormon. 

